I find that around 1 in 20 flights don't post automatically and require chasing.

Long haul flights seem to post overnight or the next day. However, intra-EU flights seem to take anywhere between 7-14 days easy.

The irony is that when you book on the SK page they show you the earnings before even paying and they can just post the points the second your plane lands. It would be very interesting (and most likely disappointing) to see the process that SK uses for posting points. The greatly varying amount of time it takes between flights to post the points makes it look like a manual process.

When flying OW I find that points typically post the next day, even if you fly a different airline than the program you are posting to.